nwdiag {

  internet [shape = cloud];

  internet -- Gibson [address = "my.awesome.dns.com"]

  network private {
      address = "10.1.1.0/24";

      Gibson    [address = "10.1.1.1"];
      Hackbardt [address = "10.1.1.2"];
      HAL       [address = "10.1.1.3"];
  }

  network "private (subnet)" {
      Hackbardt [address = "10.2.2.0/24"];
      HAL       [address = "10.2.3.0/24"];
  }

}